Rotary head tunneling machine
United States Patent 3061289
US Patent References:
Coke cleaning device
- - 2170660
Mining machines having oppositely rotating boring heads
- - 2756037
Mining machine
- - 2864600
Coke cleaning device
- - 2170660
Mining machines having oppositely rotating boring heads
- - 2756037
Mining machine
- - 2864600
Inventors:
Miller, William W.
Publication Date:
10/30/1962
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Export Citation:
Assignee:
GOODMAN MFG CO
Primary Class:
Other Classes:
299/60, 175/392, 175/319
International Classes:
E21D9/11; E21D9/10
Foreign References:
| AU167512B |